High velocity nozzle and windband assembly

ABSTRACT

A nozzle stack and windband for an exhaust fan that has a nozzle stack with two side apertures for exhaust. Arranged around the periphery of a central aperture in the conical nozzle stack are two side apertures. The nozzle stack fits over the fan outlet. A nozzle stack may extend upwardly from a central aperture. Exhaust exiting the two side apertures induces a flow, especially when the windband encircles the nozzle.

BACKGROUND OF THE INVENTION

Industrial and institutional processes often produce fumes required to be exhausted and removed from the immediate area of the building. Exhaust systems include ducts, hoods, and exhaust fans to extract the contaminated fumes. Specific applications, such as laboratory or processing exhaust, are hazardous and must be exhausted to insure the safety of those working in close proximity to the source of the exhausted effluent. Safety concerns extend not only to those in the immediate area where the fumes are generated, but also to others located in the building as well as occupants in surrounding buildings.

Improperly designed exhaust systems that ineffectively discharge high concentrations of effluent can result in entrainment of the hazardous or noxious exhaust into the building air conditioning system, contaminating the fresh air brought into the building.

Problems are encountered in particular where the contaminated exhaust is heavier than air, is corrosive or has a foul odor. In these instances it is necessary to displace the exhaust at a height allowing dispersement to negate the possibility of concentration of the effluent at ground level.

In applications where exhaust needs to be displaced high above ground level, exhaust fans and stacks are typically placed on roof tops. To insure the displacement at levels high above ground level, it is known to use long exhaust stacks having an exit orifice at the desired height. Often, the stacks are so long as to be unstable and require the use of guy wires or other braces to ensure their stability, especially if high wind conditions are ever expected.

There is a need for an improvement in the design of a windband and stack to dissipate fumes before dispersion of the exhaust within the environment occurs to allow complete dissipation and prevent concentration and contamination of the buildings at lower levels.

It is an object of the invention to provide an exhaust fan having a unique nozzle stack and windband design.

It is another object of the invention to have an exhaust with a windband and nozzle stack having a compact configuration.

It is yet another object of the invention to provide an exhaust fan with a nozzle stack requiring low energy but having a high exhaust velocity.

It is another object of the invention to provide a windband and a nozzle stack allowing dispersement preventing exhaust from reentering a building through an air conditioning system or other roof mounted equipment.

It is still another object of the invention to allow dispersement of exhaust eliminating costly corrosion caused by exhaust vapors.

It is another objective of the invention to provide an exhaust for diluting the exhaust before exiting the exhaust stack.

These and other objects of the invention will become apparent to one of ordinary skill in the art after reviewing disclosure of the invention.

SUMMARY OF THE INVENTION

A nozzle stack for an exhaust fan that has two semicircular shaped side aperture openings and a central core opening for exhaust. Arranged around the periphery of the central core opening are two semicircular side apertures. The nozzle stack is built on brackets and fits over a fan outlet. The nozzle stack fits below and inside a windband and exhaust air exiting the nozzle stack flows up through the windband into the atmosphere. The windband extends around the nozzle stack and upwardly from the central aperture. Exhaust exiting the two semicircular side apertures induces upward flow of ambient air, when the windband encircles the nozzle. The flow of the ambient air increases the volume of exhaust exiting the windband. The combination of windband and nozzle stack form a unique high velocity exhaust assembly to facilitate air flow.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the nozzle stack combination;

FIG. 2 is a view of the windband, nozzle stack, and brackets;

FIG. 3 is a perspective inside view of the windband; and

FIG. 4 is a side view of the windband and stack.

DETAILED DESCRIPTION OF THE INVENTION

The nozzle 10 depicted in FIG. 1 has two side apertures 12 and 14 formed by an upstanding walls 16 and 18. The two side apertures 12 and 14 are formed around a central core opening 20. The two side apertures 12 and 14 are semicircular in shape and run around the periphery of the nozzle stack a distance just short of the diameter of the nozzle stack circumference.

FIG. 2 shows the windband 30 fitted with the nozzle stack 10. The windband 30 has a diameter of at the bottom greater than its diameter in its middle region 34 and its top 36. The diameter of the top of the windband is greater than the diameter at its central region 34, but less than at its bottom 32. The nozzle stack 10 may be attached to the windband 30 in any conventional manner, such as being unitarily formed or joined by welding. In the illustrated embodiment, the bottom edge of the nozzle stack 10 fits under the bottom section 38 of the windband and the nozzle stack is held up by brackets 40 and 42.

FIG. 3 shows a section perspective of the windband 30 fitted over the exhaust nozzle stack 10. As seen in FIG. 3, the shaped windband 30 can sit over the nozzle stack 10 in a concentric arrangement.

Ambient air flow is induced about the nozzle stack 10, mixing with the exhaust exiting the side apertures 12 and 14. Upon exiting the windband 30, the flow of exhaust exiting the nozzle stack 10 is increased by the ambient air.

The nozzle stack 10 may be provided with sound insulation.

FIG. 4 depicts a side view of the assembled wind sack 30, nozzle stack 10 and brackets 40 and 42. The air leaves an exhaust stack and fan and enters the arcuate shaped openings 12, 14 in the nozzle stack 10 and rises up into the windband 30 and mixes with ambient air entering the opening 20 increasing the flow of the exhaust up and out of the assembly.

While the invention has been described with reference to preferred embodiment, various variations and modifications would be apparent to one of ordinary skill in the art. The invention encompasses such variations and modifications. 

1. An exhaust nozzle stack comprising: a cone with outer walls and a central aperture; and two side apertures formed along side walls of the conical side walls of the nozzle stack and running around the circumference of the cone.
 2. The nozzle stack of claim 1, wherein the two side apertures are arcuate.
 3. The nozzle stack of claim 1, wherein the central aperture runs an entire length of the cone and is open on its sides.
 4. The nozzle stack of claim 3, wherein exterior walls of the nozzle stack are tapered.
 5. The nozzle stack of claim 3, further comprising a windband extending upward and covering an exterior of the outer walls of the nozzle stack.
 6. The nozzle stack of claim 5, wherein the windband is conical and has a diameter greater at its bottom than a diameter at its top.
 7. The nozzle stack of claim of claim 6, wherein a diameter of the windband is smaller at its center than the diameter at its top.
 8. A windband and nozzle stack assembly comprising: a cone with outer walls and a central aperture; two side apertures formed along side walls of the conical side walls of the nozzle stack and running around the circumference of the cone; and a windband extending upward and covering an exterior of the outer walls of the nozzle stack.
 9. The nozzle stack of claim 8, wherein the two side apertures are arcuate.
 10. The nozzle stack of claim 8, wherein the central aperture runs an entire length of the cone and is open on its sides.
 11. The nozzle stack of claim 8, wherein exterior walls of the nozzle stack are tapered.
 12. The nozzle stack of claim 8, wherein the windband is conical and has a diameter greater at its bottom than a diameter at its top.
 13. The nozzle stack of claim of claim 8, wherein a diameter of the windband is smaller at its center than the diameter at its top. 